Fix typo.

3 jobs for master in 2 minutes and 46 seconds
Status Job ID Name Coverage
  Build
passed #31401
fp
build-coq.8.7.2

00:02:26

passed #31400
fp
build-coq.8.8.2

00:02:24

passed #31399
fp
build-coq.8.9.0

00:02:46